Year	sq. km
1990	153.8
1991	178.14
1992	202.48
1993	226.82
1994	251.16
1995	275.5
1996	299.84
1997	324.18
1998	348.52
1999	372.86
2000	397.2
2001	400.2
2002	403.2
2003	406.2
2004	409.2
2005	412.2
2006	415.2
2007	418.2
2008	421.2
2009	424.2
2010	427.2
2011	430.2
2012	433.2
2013	436.2
2014	439.2
2015	442.2
2016	445.2
2017	448.2
2018	451.2
2019	454.2
2020	457.2
2021	460.2